Air heater



FIG. 1 is a rear perspective view of a first embodiment of an air heater showing our new design.

FIG. 2 is a front perspective view of the air heater of FIG. 1.

FIG. 3 is a top view of the air heater of FIG. 1.

FIG. 4 is a rear perspective view of a second embodiment of an air heater showing our new design.

FIG. 5 is a front perspective view of the air heater of FIG. 4; and,

FIG. 6 is a top view of the air heater of FIG. 4. 

The ornamental design for an air heater, as shown and described. 